Question
Buses A and B are moving around a circular ground of
radius 420 m. If the speeds of the buses A and B are 12 m/sec and 15 m/sec respectively, then what is the difference between the time taken by bus A and B to complete 3 round of the ground?Solution
Circumference if the ground = 2πr = 2 × 22/7 × 420 = 2640 m So, distance = 2640 m Time taken by bus A to cover 3 rounds of a ground = (2640/12) × 3 = 660 Time taken by bus B to cover 3 rounds of a ground = (2640/15) × 3 = 528 Required difference = 660 – 528 = 132
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